For the first time, obesity researchers have data showing that the least healthy cereals are the ones marketed most aggressively to kids. Here's the skinny on the 10 most frequently marketed cereals to children on television

Cocoa Puffs

By Bonnie RochmanFriday, Oct. 23, 2009

This chocolatey confection not only does a lot of TV advertising, but is also one of about a dozen children's cereals that have their own Web site. Cuckooshow.com lets children explore the set of a "live" talk show with Sonny the cuckoo, watch cartoons featuring the bird and play games. Cocoa Puffs is made by General Mills, whose multi-brand site millsberry.com gets more than 750,000 unique visitors a month under age 18. The average visitor who uses the site visits 2.8 times a month and spends nearly 24 min. per session.